Mercurial > hg > truffle
annotate src/share/vm/memory/universe.cpp @ 11010:b295e132102d
8001330: Improve on checking order
Reviewed-by: acorn, hawtin
| author | mullan |
|---|---|
| date | Fri, 05 Apr 2013 10:18:36 -0400 |
| parents | 8be1318fbe77 |
| children | 7ee0d5c53c78 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
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27 #include "classfile/classLoaderData.hpp" |
| 1972 | 28 #include "classfile/javaClasses.hpp" |
| 29 #include "classfile/symbolTable.hpp" | |
| 30 #include "classfile/systemDictionary.hpp" | |
| 31 #include "classfile/vmSymbols.hpp" | |
| 32 #include "code/codeCache.hpp" | |
| 33 #include "code/dependencies.hpp" | |
| 34 #include "gc_interface/collectedHeap.inline.hpp" | |
| 35 #include "interpreter/interpreter.hpp" | |
| 36 #include "memory/cardTableModRefBS.hpp" | |
| 37 #include "memory/gcLocker.inline.hpp" | |
| 38 #include "memory/genCollectedHeap.hpp" | |
| 39 #include "memory/genRemSet.hpp" | |
| 40 #include "memory/generation.hpp" | |
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41 #include "memory/metadataFactory.hpp" |
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42 #include "memory/metaspaceShared.hpp" |
| 1972 | 43 #include "memory/oopFactory.hpp" |
| 44 #include "memory/space.hpp" | |
| 45 #include "memory/universe.hpp" | |
| 46 #include "memory/universe.inline.hpp" | |
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47 #include "oops/constantPool.hpp" |
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48 #include "oops/instanceClassLoaderKlass.hpp" |
| 1972 | 49 #include "oops/instanceKlass.hpp" |
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50 #include "oops/instanceMirrorKlass.hpp" |
| 1972 | 51 #include "oops/instanceRefKlass.hpp" |
| 52 #include "oops/oop.inline.hpp" | |
| 53 #include "oops/typeArrayKlass.hpp" | |
| 54 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
| 55 #include "runtime/aprofiler.hpp" | |
| 56 #include "runtime/arguments.hpp" | |
| 57 #include "runtime/deoptimization.hpp" | |
| 58 #include "runtime/fprofiler.hpp" | |
| 59 #include "runtime/handles.inline.hpp" | |
| 60 #include "runtime/init.hpp" | |
| 61 #include "runtime/java.hpp" | |
| 62 #include "runtime/javaCalls.hpp" | |
| 63 #include "runtime/sharedRuntime.hpp" | |
| 64 #include "runtime/synchronizer.hpp" | |
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65 #include "runtime/thread.inline.hpp" |
| 1972 | 66 #include "runtime/timer.hpp" |
| 67 #include "runtime/vm_operations.hpp" | |
| 68 #include "services/memoryService.hpp" | |
| 69 #include "utilities/copy.hpp" | |
| 70 #include "utilities/events.hpp" | |
| 71 #include "utilities/hashtable.inline.hpp" | |
| 72 #include "utilities/preserveException.hpp" | |
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73 #include "utilities/macros.hpp" |
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74 #if INCLUDE_ALL_GCS |
| 1972 | 75 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" |
| 76 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" | |
| 77 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 78 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
| 79 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
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80 #endif // INCLUDE_ALL_GCS |
| 0 | 81 |
| 82 // Known objects | |
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83 Klass* Universe::_boolArrayKlassObj = NULL; |
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84 Klass* Universe::_byteArrayKlassObj = NULL; |
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85 Klass* Universe::_charArrayKlassObj = NULL; |
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86 Klass* Universe::_intArrayKlassObj = NULL; |
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87 Klass* Universe::_shortArrayKlassObj = NULL; |
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88 Klass* Universe::_longArrayKlassObj = NULL; |
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89 Klass* Universe::_singleArrayKlassObj = NULL; |
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90 Klass* Universe::_doubleArrayKlassObj = NULL; |
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91 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; |
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92 Klass* Universe::_objectArrayKlassObj = NULL; |
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93 oop Universe::_int_mirror = NULL; |
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94 oop Universe::_float_mirror = NULL; |
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95 oop Universe::_double_mirror = NULL; |
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96 oop Universe::_byte_mirror = NULL; |
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97 oop Universe::_bool_mirror = NULL; |
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98 oop Universe::_char_mirror = NULL; |
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99 oop Universe::_long_mirror = NULL; |
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100 oop Universe::_short_mirror = NULL; |
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101 oop Universe::_void_mirror = NULL; |
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102 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; |
| 0 | 103 oop Universe::_main_thread_group = NULL; |
| 104 oop Universe::_system_thread_group = NULL; | |
| 105 objArrayOop Universe::_the_empty_class_klass_array = NULL; | |
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106 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; |
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107 oop Universe::_the_null_string = NULL; |
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108 oop Universe::_the_min_jint_string = NULL; |
| 0 | 109 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; |
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110 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; |
| 11010 | 111 LatestMethodOopCache* Universe::_pd_implies_cache = NULL; |
| 0 | 112 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; |
| 113 oop Universe::_out_of_memory_error_java_heap = NULL; | |
| 114 oop Universe::_out_of_memory_error_perm_gen = NULL; | |
| 115 oop Universe::_out_of_memory_error_array_size = NULL; | |
| 116 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; | |
| 117 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; | |
| 118 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; | |
| 119 bool Universe::_verify_in_progress = false; | |
| 120 oop Universe::_null_ptr_exception_instance = NULL; | |
| 121 oop Universe::_arithmetic_exception_instance = NULL; | |
| 122 oop Universe::_virtual_machine_error_instance = NULL; | |
| 123 oop Universe::_vm_exception = NULL; | |
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124 Array<int>* Universe::_the_empty_int_array = NULL; |
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125 Array<u2>* Universe::_the_empty_short_array = NULL; |
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126 Array<Klass*>* Universe::_the_empty_klass_array = NULL; |
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127 Array<Method*>* Universe::_the_empty_method_array = NULL; |
| 0 | 128 |
| 129 // These variables are guarded by FullGCALot_lock. | |
| 130 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) | |
| 131 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) | |
| 132 | |
| 133 // Heap | |
| 134 int Universe::_verify_count = 0; | |
| 135 | |
| 136 int Universe::_base_vtable_size = 0; | |
| 137 bool Universe::_bootstrapping = false; | |
| 138 bool Universe::_fully_initialized = false; | |
| 139 | |
| 140 size_t Universe::_heap_capacity_at_last_gc; | |
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141 size_t Universe::_heap_used_at_last_gc = 0; |
| 0 | 142 |
| 143 CollectedHeap* Universe::_collectedHeap = NULL; | |
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144 |
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145 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; |
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146 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; |
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147 address Universe::_narrow_ptrs_base; |
| 0 | 148 |
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149 size_t Universe::_class_metaspace_size; |
| 0 | 150 |
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151 void Universe::basic_type_classes_do(void f(Klass*)) { |
| 0 | 152 f(boolArrayKlassObj()); |
| 153 f(byteArrayKlassObj()); | |
| 154 f(charArrayKlassObj()); | |
| 155 f(intArrayKlassObj()); | |
| 156 f(shortArrayKlassObj()); | |
| 157 f(longArrayKlassObj()); | |
| 158 f(singleArrayKlassObj()); | |
| 159 f(doubleArrayKlassObj()); | |
| 160 } | |
| 161 | |
| 162 void Universe::oops_do(OopClosure* f, bool do_all) { | |
| 163 | |
| 164 f->do_oop((oop*) &_int_mirror); | |
| 165 f->do_oop((oop*) &_float_mirror); | |
| 166 f->do_oop((oop*) &_double_mirror); | |
| 167 f->do_oop((oop*) &_byte_mirror); | |
| 168 f->do_oop((oop*) &_bool_mirror); | |
| 169 f->do_oop((oop*) &_char_mirror); | |
| 170 f->do_oop((oop*) &_long_mirror); | |
| 171 f->do_oop((oop*) &_short_mirror); | |
| 172 f->do_oop((oop*) &_void_mirror); | |
| 173 | |
| 174 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 175 f->do_oop((oop*) &_mirrors[i]); | |
| 176 } | |
| 177 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); | |
| 178 | |
| 179 f->do_oop((oop*)&_the_empty_class_klass_array); | |
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180 f->do_oop((oop*)&_the_null_string); |
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181 f->do_oop((oop*)&_the_min_jint_string); |
| 0 | 182 f->do_oop((oop*)&_out_of_memory_error_java_heap); |
| 183 f->do_oop((oop*)&_out_of_memory_error_perm_gen); | |
| 184 f->do_oop((oop*)&_out_of_memory_error_array_size); | |
| 185 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); | |
| 186 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); | |
| 187 f->do_oop((oop*)&_null_ptr_exception_instance); | |
| 188 f->do_oop((oop*)&_arithmetic_exception_instance); | |
| 189 f->do_oop((oop*)&_virtual_machine_error_instance); | |
| 190 f->do_oop((oop*)&_main_thread_group); | |
| 191 f->do_oop((oop*)&_system_thread_group); | |
| 192 f->do_oop((oop*)&_vm_exception); | |
| 193 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) | |
| 194 } | |
| 195 | |
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196 // Serialize metadata in and out of CDS archive, not oops. |
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197 void Universe::serialize(SerializeClosure* f, bool do_all) { |
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198 |
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199 f->do_ptr((void**)&_boolArrayKlassObj); |
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200 f->do_ptr((void**)&_byteArrayKlassObj); |
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201 f->do_ptr((void**)&_charArrayKlassObj); |
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202 f->do_ptr((void**)&_intArrayKlassObj); |
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203 f->do_ptr((void**)&_shortArrayKlassObj); |
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204 f->do_ptr((void**)&_longArrayKlassObj); |
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205 f->do_ptr((void**)&_singleArrayKlassObj); |
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206 f->do_ptr((void**)&_doubleArrayKlassObj); |
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207 f->do_ptr((void**)&_objectArrayKlassObj); |
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208 |
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209 { |
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210 for (int i = 0; i < T_VOID+1; i++) { |
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211 if (_typeArrayKlassObjs[i] != NULL) { |
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212 assert(i >= T_BOOLEAN, "checking"); |
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213 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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214 } else if (do_all) { |
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215 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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216 } |
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217 } |
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218 } |
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219 |
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220 f->do_ptr((void**)&_the_array_interfaces_array); |
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221 f->do_ptr((void**)&_the_empty_int_array); |
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222 f->do_ptr((void**)&_the_empty_short_array); |
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223 f->do_ptr((void**)&_the_empty_method_array); |
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224 f->do_ptr((void**)&_the_empty_klass_array); |
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225 _finalizer_register_cache->serialize(f); |
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226 _loader_addClass_cache->serialize(f); |
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227 _reflect_invoke_cache->serialize(f); |
| 11010 | 228 _pd_implies_cache->serialize(f); |
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229 } |
| 0 | 230 |
| 231 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { | |
| 232 if (size < alignment || size % alignment != 0) { | |
| 233 ResourceMark rm; | |
| 234 stringStream st; | |
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235 st.print("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment); |
| 0 | 236 char* error = st.as_string(); |
| 237 vm_exit_during_initialization(error); | |
| 238 } | |
| 239 } | |
| 240 | |
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241 void initialize_basic_type_klass(Klass* k, TRAPS) { |
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242 Klass* ok = SystemDictionary::Object_klass(); |
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243 if (UseSharedSpaces) { |
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244 assert(k->super() == ok, "u3"); |
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245 k->restore_unshareable_info(CHECK); |
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246 } else { |
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247 k->initialize_supers(ok, CHECK); |
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248 } |
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249 k->append_to_sibling_list(); |
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250 } |
| 0 | 251 |
| 252 void Universe::genesis(TRAPS) { | |
| 253 ResourceMark rm; | |
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254 |
| 0 | 255 { FlagSetting fs(_bootstrapping, true); |
| 256 | |
| 257 { MutexLocker mc(Compile_lock); | |
| 258 | |
| 259 // determine base vtable size; without that we cannot create the array klasses | |
| 260 compute_base_vtable_size(); | |
| 261 | |
| 262 if (!UseSharedSpaces) { | |
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263 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); |
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264 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); |
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265 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); |
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266 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); |
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267 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); |
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268 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); |
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269 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); |
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270 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); |
| 0 | 271 |
| 272 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; | |
| 273 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; | |
| 274 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; | |
| 275 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; | |
| 276 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; | |
| 277 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; | |
| 278 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; | |
| 279 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; | |
| 280 | |
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281 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); |
| 0 | 282 |
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283 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); |
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284 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); |
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285 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); |
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286 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); |
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287 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); |
| 0 | 288 } |
| 289 } | |
| 290 | |
| 291 vmSymbols::initialize(CHECK); | |
| 292 | |
| 293 SystemDictionary::initialize(CHECK); | |
| 294 | |
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295 Klass* ok = SystemDictionary::Object_klass(); |
| 0 | 296 |
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297 _the_null_string = StringTable::intern("null", CHECK); |
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298 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); |
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299 |
| 0 | 300 if (UseSharedSpaces) { |
| 301 // Verify shared interfaces array. | |
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302 assert(_the_array_interfaces_array->at(0) == |
| 1142 | 303 SystemDictionary::Cloneable_klass(), "u3"); |
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304 assert(_the_array_interfaces_array->at(1) == |
| 1142 | 305 SystemDictionary::Serializable_klass(), "u3"); |
| 0 | 306 } else { |
| 307 // Set up shared interfaces array. (Do this before supers are set up.) | |
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308 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); |
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309 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); |
| 0 | 310 } |
| 311 | |
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312 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); |
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313 initialize_basic_type_klass(charArrayKlassObj(), CHECK); |
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314 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); |
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315 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); |
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316 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); |
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317 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); |
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318 initialize_basic_type_klass(intArrayKlassObj(), CHECK); |
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319 initialize_basic_type_klass(longArrayKlassObj(), CHECK); |
| 0 | 320 } // end of core bootstrapping |
| 321 | |
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322 // Maybe this could be lifted up now that object array can be initialized |
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323 // during the bootstrapping. |
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324 |
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325 // OLD |
| 0 | 326 // Initialize _objectArrayKlass after core bootstraping to make |
| 327 // sure the super class is set up properly for _objectArrayKlass. | |
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328 // --- |
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329 // NEW |
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330 // Since some of the old system object arrays have been converted to |
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331 // ordinary object arrays, _objectArrayKlass will be loaded when |
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332 // SystemDictionary::initialize(CHECK); is run. See the extra check |
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333 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. |
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334 _objectArrayKlassObj = InstanceKlass:: |
| 1142 | 335 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); |
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336 // OLD |
| 0 | 337 // Add the class to the class hierarchy manually to make sure that |
| 338 // its vtable is initialized after core bootstrapping is completed. | |
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339 // --- |
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340 // New |
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341 // Have already been initialized. |
| 6983 | 342 _objectArrayKlassObj->append_to_sibling_list(); |
| 0 | 343 |
| 344 // Compute is_jdk version flags. | |
| 345 // Only 1.3 or later has the java.lang.Shutdown class. | |
| 346 // Only 1.4 or later has the java.lang.CharSequence interface. | |
| 347 // Only 1.5 or later has the java.lang.management.MemoryUsage class. | |
| 242 | 348 if (JDK_Version::is_partially_initialized()) { |
| 349 uint8_t jdk_version; | |
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350 Klass* k = SystemDictionary::resolve_or_null( |
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351 vmSymbols::java_lang_management_MemoryUsage(), THREAD); |
| 0 | 352 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 353 if (k == NULL) { | |
| 242 | 354 k = SystemDictionary::resolve_or_null( |
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355 vmSymbols::java_lang_CharSequence(), THREAD); |
| 0 | 356 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 357 if (k == NULL) { | |
| 242 | 358 k = SystemDictionary::resolve_or_null( |
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359 vmSymbols::java_lang_Shutdown(), THREAD); |
| 0 | 360 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 361 if (k == NULL) { | |
| 242 | 362 jdk_version = 2; |
| 0 | 363 } else { |
| 242 | 364 jdk_version = 3; |
| 0 | 365 } |
| 366 } else { | |
| 242 | 367 jdk_version = 4; |
| 0 | 368 } |
| 369 } else { | |
| 242 | 370 jdk_version = 5; |
| 0 | 371 } |
| 242 | 372 JDK_Version::fully_initialize(jdk_version); |
| 0 | 373 } |
| 374 | |
| 375 #ifdef ASSERT | |
| 376 if (FullGCALot) { | |
| 377 // Allocate an array of dummy objects. | |
| 378 // We'd like these to be at the bottom of the old generation, | |
| 379 // so that when we free one and then collect, | |
| 380 // (almost) the whole heap moves | |
| 381 // and we find out if we actually update all the oops correctly. | |
| 382 // But we can't allocate directly in the old generation, | |
| 383 // so we allocate wherever, and hope that the first collection | |
| 384 // moves these objects to the bottom of the old generation. | |
| 385 // We can allocate directly in the permanent generation, so we do. | |
| 386 int size; | |
| 387 if (UseConcMarkSweepGC) { | |
| 388 warning("Using +FullGCALot with concurrent mark sweep gc " | |
| 389 "will not force all objects to relocate"); | |
| 390 size = FullGCALotDummies; | |
| 391 } else { | |
| 392 size = FullGCALotDummies * 2; | |
| 393 } | |
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394 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); |
| 0 | 395 objArrayHandle dummy_array(THREAD, naked_array); |
| 396 int i = 0; | |
| 397 while (i < size) { | |
| 398 // Allocate dummy in old generation | |
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399 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); |
| 0 | 400 dummy_array->obj_at_put(i++, dummy); |
| 401 } | |
| 402 { | |
| 403 // Only modify the global variable inside the mutex. | |
| 404 // If we had a race to here, the other dummy_array instances | |
| 405 // and their elements just get dropped on the floor, which is fine. | |
| 406 MutexLocker ml(FullGCALot_lock); | |
| 407 if (_fullgc_alot_dummy_array == NULL) { | |
| 408 _fullgc_alot_dummy_array = dummy_array(); | |
| 409 } | |
| 410 } | |
| 411 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); | |
| 412 } | |
| 413 #endif | |
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414 |
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415 // Initialize dependency array for null class loader |
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416 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); |
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417 |
| 0 | 418 } |
| 419 | |
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420 // CDS support for patching vtables in metadata in the shared archive. |
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421 // All types inherited from Metadata have vtables, but not types inherited |
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422 // from MetaspaceObj, because the latter does not have virtual functions. |
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423 // If the metadata type has a vtable, it cannot be shared in the read-only |
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424 // section of the CDS archive, because the vtable pointer is patched. |
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425 static inline void add_vtable(void** list, int* n, void* o, int count) { |
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426 guarantee((*n) < count, "vtable list too small"); |
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427 void* vtable = dereference_vptr(o); |
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428 assert(*(void**)(vtable) != NULL, "invalid vtable"); |
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429 list[(*n)++] = vtable; |
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430 } |
| 0 | 431 |
| 432 void Universe::init_self_patching_vtbl_list(void** list, int count) { | |
| 433 int n = 0; | |
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434 { InstanceKlass o; add_vtable(list, &n, &o, count); } |
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435 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } |
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436 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } |
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437 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } |
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438 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } |
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439 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } |
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440 { Method o; add_vtable(list, &n, &o, count); } |
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441 { ConstantPool o; add_vtable(list, &n, &o, count); } |
| 0 | 442 } |
| 443 | |
| 444 void Universe::initialize_basic_type_mirrors(TRAPS) { | |
| 445 assert(_int_mirror==NULL, "basic type mirrors already initialized"); | |
| 446 _int_mirror = | |
| 447 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); | |
| 448 _float_mirror = | |
| 449 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); | |
| 450 _double_mirror = | |
| 451 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); | |
| 452 _byte_mirror = | |
| 453 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); | |
| 454 _bool_mirror = | |
| 455 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); | |
| 456 _char_mirror = | |
| 457 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); | |
| 458 _long_mirror = | |
| 459 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); | |
| 460 _short_mirror = | |
| 461 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); | |
| 462 _void_mirror = | |
| 463 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); | |
| 464 | |
| 465 _mirrors[T_INT] = _int_mirror; | |
| 466 _mirrors[T_FLOAT] = _float_mirror; | |
| 467 _mirrors[T_DOUBLE] = _double_mirror; | |
| 468 _mirrors[T_BYTE] = _byte_mirror; | |
| 469 _mirrors[T_BOOLEAN] = _bool_mirror; | |
| 470 _mirrors[T_CHAR] = _char_mirror; | |
| 471 _mirrors[T_LONG] = _long_mirror; | |
| 472 _mirrors[T_SHORT] = _short_mirror; | |
| 473 _mirrors[T_VOID] = _void_mirror; | |
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474 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); |
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475 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); |
| 0 | 476 } |
| 477 | |
| 478 void Universe::fixup_mirrors(TRAPS) { | |
| 479 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, | |
| 480 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply | |
| 481 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note | |
| 482 // that the number of objects allocated at this point is very small. | |
| 1142 | 483 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); |
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484 HandleMark hm(THREAD); |
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485 // Cache the start of the static fields |
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486 InstanceMirrorKlass::init_offset_of_static_fields(); |
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487 |
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488 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); |
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489 int list_length = list->length(); |
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490 for (int i = 0; i < list_length; i++) { |
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491 Klass* k = list->at(i); |
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492 assert(k->is_klass(), "List should only hold classes"); |
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493 EXCEPTION_MARK; |
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494 KlassHandle kh(THREAD, k); |
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495 java_lang_Class::fixup_mirror(kh, CATCH); |
| 0 | 496 } |
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497 delete java_lang_Class::fixup_mirror_list(); |
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498 java_lang_Class::set_fixup_mirror_list(NULL); |
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499 } |
| 0 | 500 |
| 501 static bool has_run_finalizers_on_exit = false; | |
| 502 | |
| 503 void Universe::run_finalizers_on_exit() { | |
| 504 if (has_run_finalizers_on_exit) return; | |
| 505 has_run_finalizers_on_exit = true; | |
| 506 | |
| 507 // Called on VM exit. This ought to be run in a separate thread. | |
| 508 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); | |
| 509 { | |
| 510 PRESERVE_EXCEPTION_MARK; | |
| 1142 | 511 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); |
| 0 | 512 JavaValue result(T_VOID); |
| 513 JavaCalls::call_static( | |
| 514 &result, | |
| 515 finalizer_klass, | |
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516 vmSymbols::run_finalizers_on_exit_name(), |
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517 vmSymbols::void_method_signature(), |
| 0 | 518 THREAD |
| 519 ); | |
| 520 // Ignore any pending exceptions | |
| 521 CLEAR_PENDING_EXCEPTION; | |
| 522 } | |
| 523 } | |
| 524 | |
| 525 | |
| 526 // initialize_vtable could cause gc if | |
| 527 // 1) we specified true to initialize_vtable and | |
| 528 // 2) this ran after gc was enabled | |
| 529 // In case those ever change we use handles for oops | |
| 530 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { | |
| 531 // init vtable of k and all subclasses | |
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532 Klass* ko = k_h(); |
| 0 | 533 klassVtable* vt = ko->vtable(); |
| 534 if (vt) vt->initialize_vtable(false, CHECK); | |
| 535 if (ko->oop_is_instance()) { | |
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536 InstanceKlass* ik = (InstanceKlass*)ko; |
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537 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) { |
| 0 | 538 reinitialize_vtable_of(s_h, CHECK); |
| 539 } | |
| 540 } | |
| 541 } | |
| 542 | |
| 543 | |
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544 void initialize_itable_for_klass(Klass* k, TRAPS) { |
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545 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); |
| 0 | 546 } |
| 547 | |
| 548 | |
| 549 void Universe::reinitialize_itables(TRAPS) { | |
| 550 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); | |
| 551 | |
| 552 } | |
| 553 | |
| 554 | |
| 555 bool Universe::on_page_boundary(void* addr) { | |
| 556 return ((uintptr_t) addr) % os::vm_page_size() == 0; | |
| 557 } | |
| 558 | |
| 559 | |
| 560 bool Universe::should_fill_in_stack_trace(Handle throwable) { | |
| 561 // never attempt to fill in the stack trace of preallocated errors that do not have | |
| 562 // backtrace. These errors are kept alive forever and may be "re-used" when all | |
| 563 // preallocated errors with backtrace have been consumed. Also need to avoid | |
| 564 // a potential loop which could happen if an out of memory occurs when attempting | |
| 565 // to allocate the backtrace. | |
| 566 return ((throwable() != Universe::_out_of_memory_error_java_heap) && | |
| 567 (throwable() != Universe::_out_of_memory_error_perm_gen) && | |
| 568 (throwable() != Universe::_out_of_memory_error_array_size) && | |
| 569 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); | |
| 570 } | |
| 571 | |
| 572 | |
| 573 oop Universe::gen_out_of_memory_error(oop default_err) { | |
| 574 // generate an out of memory error: | |
| 575 // - if there is a preallocated error with backtrace available then return it wth | |
| 576 // a filled in stack trace. | |
| 577 // - if there are no preallocated errors with backtrace available then return | |
| 578 // an error without backtrace. | |
| 579 int next; | |
| 580 if (_preallocated_out_of_memory_error_avail_count > 0) { | |
| 581 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); | |
| 582 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); | |
| 583 } else { | |
| 584 next = -1; | |
| 585 } | |
| 586 if (next < 0) { | |
| 587 // all preallocated errors have been used. | |
| 588 // return default | |
| 589 return default_err; | |
| 590 } else { | |
| 591 // get the error object at the slot and set set it to NULL so that the | |
| 592 // array isn't keeping it alive anymore. | |
| 593 oop exc = preallocated_out_of_memory_errors()->obj_at(next); | |
| 594 assert(exc != NULL, "slot has been used already"); | |
| 595 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); | |
| 596 | |
| 597 // use the message from the default error | |
| 598 oop msg = java_lang_Throwable::message(default_err); | |
| 599 assert(msg != NULL, "no message"); | |
| 600 java_lang_Throwable::set_message(exc, msg); | |
| 601 | |
| 602 // populate the stack trace and return it. | |
| 603 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); | |
| 604 return exc; | |
| 605 } | |
| 606 } | |
| 607 | |
| 608 static intptr_t non_oop_bits = 0; | |
| 609 | |
| 610 void* Universe::non_oop_word() { | |
| 611 // Neither the high bits nor the low bits of this value is allowed | |
| 612 // to look like (respectively) the high or low bits of a real oop. | |
| 613 // | |
| 614 // High and low are CPU-specific notions, but low always includes | |
| 615 // the low-order bit. Since oops are always aligned at least mod 4, | |
| 616 // setting the low-order bit will ensure that the low half of the | |
| 617 // word will never look like that of a real oop. | |
| 618 // | |
| 619 // Using the OS-supplied non-memory-address word (usually 0 or -1) | |
| 620 // will take care of the high bits, however many there are. | |
| 621 | |
| 622 if (non_oop_bits == 0) { | |
| 623 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; | |
| 624 } | |
| 625 | |
| 626 return (void*)non_oop_bits; | |
| 627 } | |
| 628 | |
| 629 jint universe_init() { | |
| 630 assert(!Universe::_fully_initialized, "called after initialize_vtables"); | |
| 631 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), | |
| 632 "LogHeapWordSize is incorrect."); | |
| 633 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); | |
| 634 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, | |
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635 "oop size is not not a multiple of HeapWord size"); |
| 0 | 636 TraceTime timer("Genesis", TraceStartupTime); |
| 637 GC_locker::lock(); // do not allow gc during bootstrapping | |
| 638 JavaClasses::compute_hard_coded_offsets(); | |
| 639 | |
| 640 jint status = Universe::initialize_heap(); | |
| 641 if (status != JNI_OK) { | |
| 642 return status; | |
| 643 } | |
| 644 | |
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645 // Create memory for metadata. Must be after initializing heap for |
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646 // DumpSharedSpaces. |
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647 ClassLoaderData::init_null_class_loader_data(); |
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648 |
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649 // We have a heap so create the Method* caches before |
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650 // Metaspace::initialize_shared_spaces() tries to populate them. |
| 0 | 651 Universe::_finalizer_register_cache = new LatestMethodOopCache(); |
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652 Universe::_loader_addClass_cache = new LatestMethodOopCache(); |
| 11010 | 653 Universe::_pd_implies_cache = new LatestMethodOopCache(); |
| 0 | 654 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); |
| 655 | |
| 656 if (UseSharedSpaces) { | |
| 657 // Read the data structures supporting the shared spaces (shared | |
| 658 // system dictionary, symbol table, etc.). After that, access to | |
| 659 // the file (other than the mapped regions) is no longer needed, and | |
| 660 // the file is closed. Closing the file does not affect the | |
| 661 // currently mapped regions. | |
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662 MetaspaceShared::initialize_shared_spaces(); |
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663 StringTable::create_table(); |
| 0 | 664 } else { |
| 665 SymbolTable::create_table(); | |
| 666 StringTable::create_table(); | |
| 667 ClassLoader::create_package_info_table(); | |
| 668 } | |
| 669 | |
| 670 return JNI_OK; | |
| 671 } | |
| 672 | |
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673 // Choose the heap base address and oop encoding mode |
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674 // when compressed oops are used: |
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675 // Unscaled - Use 32-bits oops without encoding when |
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676 // NarrowOopHeapBaseMin + heap_size < 4Gb |
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677 // ZeroBased - Use zero based compressed oops with encoding when |
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678 // NarrowOopHeapBaseMin + heap_size < 32Gb |
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679 // HeapBased - Use compressed oops with heap base + encoding. |
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680 |
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681 // 4Gb |
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682 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); |
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683 // 32Gb |
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684 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; |
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685 |
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686 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { |
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687 size_t base = 0; |
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688 #ifdef _LP64 |
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689 if (UseCompressedOops) { |
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690 assert(mode == UnscaledNarrowOop || |
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691 mode == ZeroBasedNarrowOop || |
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692 mode == HeapBasedNarrowOop, "mode is invalid"); |
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693 const size_t total_size = heap_size + HeapBaseMinAddress; |
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694 // Return specified base for the first request. |
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695 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { |
|
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696 base = HeapBaseMinAddress; |
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697 |
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698 // If the total size and the metaspace size are small enough to allow |
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699 // UnscaledNarrowOop then just use UnscaledNarrowOop. |
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700 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop) && |
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701 (!UseCompressedKlassPointers || |
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702 (((OopEncodingHeapMax - heap_size) + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax))) { |
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703 // We don't need to check the metaspace size here because it is always smaller |
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704 // than total_size. |
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705 if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) && |
|
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706 (Universe::narrow_oop_shift() == 0)) { |
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707 // Use 32-bits oops without encoding and |
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708 // place heap's top on the 4Gb boundary |
|
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709 base = (NarrowOopHeapMax - heap_size); |
|
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710 } else { |
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711 // Can't reserve with NarrowOopShift == 0 |
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712 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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713 if (mode == UnscaledNarrowOop || |
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714 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { |
|
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715 // Use zero based compressed oops with encoding and |
|
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716 // place heap's top on the 32Gb boundary in case |
|
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717 // total_size > 4Gb or failed to reserve below 4Gb. |
|
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718 base = (OopEncodingHeapMax - heap_size); |
|
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719 } |
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720 } |
|
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721 |
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722 // See if ZeroBaseNarrowOop encoding will work for a heap based at |
|
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723 // (KlassEncodingMetaspaceMax - class_metaspace_size()). |
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724 } else if (UseCompressedKlassPointers && (mode != HeapBasedNarrowOop) && |
|
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725 (Universe::class_metaspace_size() + HeapBaseMinAddress <= KlassEncodingMetaspaceMax) && |
|
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726 (KlassEncodingMetaspaceMax + heap_size - Universe::class_metaspace_size() <= OopEncodingHeapMax)) { |
|
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727 base = (KlassEncodingMetaspaceMax - Universe::class_metaspace_size()); |
|
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728 } else { |
|
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729 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or |
|
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730 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. |
|
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731 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
|
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732 } |
|
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733 |
|
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734 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks |
|
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735 // used in ReservedHeapSpace() constructors. |
|
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736 // The final values will be set in initialize_heap() below. |
|
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737 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax) && |
|
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|
738 (!UseCompressedKlassPointers || (base + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax)) { |
|
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739 // Use zero based compressed oops |
|
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740 Universe::set_narrow_oop_base(NULL); |
|
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741 // Don't need guard page for implicit checks in indexed |
|
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742 // addressing mode with zero based Compressed Oops. |
|
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|
743 Universe::set_narrow_oop_use_implicit_null_checks(true); |
|
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744 } else { |
|
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|
745 // Set to a non-NULL value so the ReservedSpace ctor computes |
|
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|
746 // the correct no-access prefix. |
|
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747 // The final value will be set in initialize_heap() below. |
|
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|
748 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); |
|
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|
749 #ifdef _WIN64 |
|
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750 if (UseLargePages) { |
|
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|
751 // Cannot allocate guard pages for implicit checks in indexed |
|
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|
752 // addressing mode when large pages are specified on windows. |
|
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|
753 Universe::set_narrow_oop_use_implicit_null_checks(false); |
|
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754 } |
|
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|
755 #endif // _WIN64 |
|
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|
756 } |
|
642
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|
757 } |
|
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|
758 #endif |
|
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|
759 return (char*)base; // also return NULL (don't care) for 32-bit VM |
|
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|
760 } |
|
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|
761 |
| 0 | 762 jint Universe::initialize_heap() { |
| 763 | |
| 764 if (UseParallelGC) { | |
|
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|
765 #if INCLUDE_ALL_GCS |
| 0 | 766 Universe::_collectedHeap = new ParallelScavengeHeap(); |
|
8001
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767 #else // INCLUDE_ALL_GCS |
|
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|
768 fatal("UseParallelGC not supported in this VM."); |
|
8001
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|
769 #endif // INCLUDE_ALL_GCS |
| 0 | 770 |
|
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771 } else if (UseG1GC) { |
|
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772 #if INCLUDE_ALL_GCS |
| 4013 | 773 G1CollectorPolicy* g1p = new G1CollectorPolicy(); |
|
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774 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); |
|
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|
775 Universe::_collectedHeap = g1h; |
|
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776 #else // INCLUDE_ALL_GCS |
|
342
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|
777 fatal("UseG1GC not supported in java kernel vm."); |
|
8001
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|
778 #endif // INCLUDE_ALL_GCS |
|
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|
779 |
| 0 | 780 } else { |
| 781 GenCollectorPolicy *gc_policy; | |
| 782 | |
| 783 if (UseSerialGC) { | |
| 784 gc_policy = new MarkSweepPolicy(); | |
| 785 } else if (UseConcMarkSweepGC) { | |
|
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786 #if INCLUDE_ALL_GCS |
| 0 | 787 if (UseAdaptiveSizePolicy) { |
| 788 gc_policy = new ASConcurrentMarkSweepPolicy(); | |
| 789 } else { | |
| 790 gc_policy = new ConcurrentMarkSweepPolicy(); | |
| 791 } | |
|
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|
792 #else // INCLUDE_ALL_GCS |
|
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|
793 fatal("UseConcMarkSweepGC not supported in this VM."); |
|
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|
794 #endif // INCLUDE_ALL_GCS |
| 0 | 795 } else { // default old generation |
| 796 gc_policy = new MarkSweepPolicy(); | |
| 797 } | |
| 798 | |
| 799 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); | |
| 800 } | |
| 801 | |
| 802 jint status = Universe::heap()->initialize(); | |
| 803 if (status != JNI_OK) { | |
| 804 return status; | |
| 805 } | |
|
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806 |
|
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|
807 #ifdef _LP64 |
|
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|
808 if (UseCompressedOops) { |
|
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|
809 // Subtract a page because something can get allocated at heap base. |
|
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810 // This also makes implicit null checking work, because the |
|
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|
811 // memory+1 page below heap_base needs to cause a signal. |
|
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|
812 // See needs_explicit_null_check. |
|
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|
813 // Only set the heap base for compressed oops because it indicates |
|
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|
814 // compressed oops for pstack code. |
| 2080 | 815 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); |
| 816 if (verbose) { | |
|
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817 tty->cr(); |
| 1963 | 818 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", |
| 819 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); | |
|
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820 } |
|
7982
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|
821 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) || |
|
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|
822 (UseCompressedKlassPointers && |
|
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|
823 ((uint64_t)Universe::heap()->base() + Universe::class_metaspace_size() > KlassEncodingMetaspaceMax))) { |
|
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|
824 // Can't reserve heap below 32Gb. |
|
6848
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|
825 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() |
|
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826 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
| 2080 | 827 if (verbose) { |
|
642
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828 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); |
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829 } |
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830 } else { |
|
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831 Universe::set_narrow_oop_base(0); |
| 2080 | 832 if (verbose) { |
|
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833 tty->print(", zero based Compressed Oops"); |
|
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834 } |
|
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835 #ifdef _WIN64 |
|
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836 if (!Universe::narrow_oop_use_implicit_null_checks()) { |
|
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837 // Don't need guard page for implicit checks in indexed addressing |
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838 // mode with zero based Compressed Oops. |
|
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839 Universe::set_narrow_oop_use_implicit_null_checks(true); |
|
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840 } |
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841 #endif // _WIN64 |
|
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842 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { |
|
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843 // Can't reserve heap below 4Gb. |
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844 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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845 } else { |
|
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846 Universe::set_narrow_oop_shift(0); |
| 2080 | 847 if (verbose) { |
|
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848 tty->print(", 32-bits Oops"); |
|
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849 } |
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850 } |
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851 } |
| 2080 | 852 if (verbose) { |
|
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853 tty->cr(); |
|
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854 tty->cr(); |
|
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855 } |
|
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856 if (UseCompressedKlassPointers) { |
|
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857 Universe::set_narrow_klass_base(Universe::narrow_oop_base()); |
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858 Universe::set_narrow_klass_shift(MIN2(Universe::narrow_oop_shift(), LogKlassAlignmentInBytes)); |
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859 } |
|
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860 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); |
|
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861 } |
|
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862 // Universe::narrow_oop_base() is one page below the metaspace |
|
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863 // base. The actual metaspace base depends on alignment constraints |
|
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864 // so we don't know its exact location here. |
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865 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - os::vm_page_size() - ClassMetaspaceSize) || |
|
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866 Universe::narrow_oop_base() == NULL, "invalid value"); |
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867 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || |
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868 Universe::narrow_oop_shift() == 0, "invalid value"); |
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869 #endif |
| 0 | 870 |
| 871 // We will never reach the CATCH below since Exceptions::_throw will cause | |
| 872 // the VM to exit if an exception is thrown during initialization | |
| 873 | |
| 874 if (UseTLAB) { | |
| 875 assert(Universe::heap()->supports_tlab_allocation(), | |
| 876 "Should support thread-local allocation buffers"); | |
| 877 ThreadLocalAllocBuffer::startup_initialization(); | |
| 878 } | |
| 879 return JNI_OK; | |
| 880 } | |
| 881 | |
|
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882 |
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883 // Reserve the Java heap, which is now the same for all GCs. |
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884 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { |
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885 // Add in the class metaspace area so the classes in the headers can |
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886 // be compressed the same as instances. |
|
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887 // Need to round class space size up because it's below the heap and |
|
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888 // the actual alignment depends on its size. |
|
7982
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889 Universe::set_class_metaspace_size(align_size_up(ClassMetaspaceSize, alignment)); |
|
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890 size_t total_reserved = align_size_up(heap_size + Universe::class_metaspace_size(), alignment); |
|
8741
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891 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), |
|
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892 "heap size is too big for compressed oops"); |
|
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893 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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894 |
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895 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr); |
|
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896 |
|
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897 if (UseCompressedOops) { |
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898 if (addr != NULL && !total_rs.is_reserved()) { |
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899 // Failed to reserve at specified address - the requested memory |
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900 // region is taken already, for example, by 'java' launcher. |
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901 // Try again to reserver heap higher. |
|
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902 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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903 |
|
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904 ReservedHeapSpace total_rs0(total_reserved, alignment, |
|
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905 UseLargePages, addr); |
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906 |
|
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907 if (addr != NULL && !total_rs0.is_reserved()) { |
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908 // Failed to reserve at specified address again - give up. |
|
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909 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
|
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910 assert(addr == NULL, ""); |
|
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911 |
|
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912 ReservedHeapSpace total_rs1(total_reserved, alignment, |
|
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913 UseLargePages, addr); |
|
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914 total_rs = total_rs1; |
|
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915 } else { |
|
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916 total_rs = total_rs0; |
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917 } |
|
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918 } |
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919 } |
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|
920 |
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921 if (!total_rs.is_reserved()) { |
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922 vm_exit_during_initialization(err_msg("Could not reserve enough space for object heap %d bytes", total_reserved)); |
|
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923 return total_rs; |
|
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924 } |
|
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925 |
|
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926 // Split the reserved space into main Java heap and a space for |
|
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927 // classes so that they can be compressed using the same algorithm |
|
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928 // as compressed oops. If compress oops and compress klass ptrs are |
|
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929 // used we need the meta space first: if the alignment used for |
|
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930 // compressed oops is greater than the one used for compressed klass |
|
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|
931 // ptrs, a metadata space on top of the heap could become |
|
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|
932 // unreachable. |
|
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|
933 ReservedSpace class_rs = total_rs.first_part(Universe::class_metaspace_size()); |
|
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934 ReservedSpace heap_rs = total_rs.last_part(Universe::class_metaspace_size(), alignment); |
|
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935 Metaspace::initialize_class_space(class_rs); |
|
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936 |
|
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|
937 if (UseCompressedOops) { |
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|
938 // Universe::initialize_heap() will reset this to NULL if unscaled |
|
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939 // or zero-based narrow oops are actually used. |
|
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940 address base = (address)(total_rs.base() - os::vm_page_size()); |
|
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941 Universe::set_narrow_oop_base(base); |
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|
942 } |
|
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943 return heap_rs; |
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944 } |
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945 |
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946 |
| 0 | 947 // It's the caller's repsonsibility to ensure glitch-freedom |
| 948 // (if required). | |
| 949 void Universe::update_heap_info_at_gc() { | |
| 950 _heap_capacity_at_last_gc = heap()->capacity(); | |
| 951 _heap_used_at_last_gc = heap()->used(); | |
| 952 } | |
| 953 | |
| 954 | |
| 955 | |
| 956 void universe2_init() { | |
| 957 EXCEPTION_MARK; | |
| 958 Universe::genesis(CATCH); | |
| 959 } | |
| 960 | |
| 961 | |
| 962 // This function is defined in JVM.cpp | |
| 963 extern void initialize_converter_functions(); | |
| 964 | |
| 965 bool universe_post_init() { | |
|
1959
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|
966 assert(!is_init_completed(), "Error: initialization not yet completed!"); |
| 0 | 967 Universe::_fully_initialized = true; |
| 968 EXCEPTION_MARK; | |
| 969 { ResourceMark rm; | |
| 970 Interpreter::initialize(); // needed for interpreter entry points | |
| 971 if (!UseSharedSpaces) { | |
|
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972 HandleMark hm(THREAD); |
| 1142 | 973 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); |
| 0 | 974 Universe::reinitialize_vtable_of(ok_h, CHECK_false); |
| 975 Universe::reinitialize_itables(CHECK_false); | |
| 976 } | |
| 977 } | |
| 978 | |
|
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979 HandleMark hm(THREAD); |
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980 Klass* k; |
| 0 | 981 instanceKlassHandle k_h; |
| 982 // Setup preallocated empty java.lang.Class array | |
| 1142 | 983 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); |
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984 |
| 0 | 985 // Setup preallocated OutOfMemoryError errors |
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986 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); |
| 0 | 987 k_h = instanceKlassHandle(THREAD, k); |
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988 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); |
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989 Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false); |
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990 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); |
| 0 | 991 Universe::_out_of_memory_error_gc_overhead_limit = |
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992 k_h->allocate_instance(CHECK_false); |
| 0 | 993 |
| 994 // Setup preallocated NullPointerException | |
| 995 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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996 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); |
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997 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
| 0 | 998 // Setup preallocated ArithmeticException |
| 999 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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1000 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); |
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1001 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
| 0 | 1002 // Virtual Machine Error for when we get into a situation we can't resolve |
| 1003 k = SystemDictionary::resolve_or_fail( | |
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1004 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); |
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1005 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); |
| 0 | 1006 if (!linked) { |
| 1007 tty->print_cr("Unable to link/verify VirtualMachineError class"); | |
| 1008 return false; // initialization failed | |
| 1009 } | |
| 1010 Universe::_virtual_machine_error_instance = | |
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1011 InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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1012 |
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1013 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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1014 |
| 0 | 1015 if (!DumpSharedSpaces) { |
| 1016 // These are the only Java fields that are currently set during shared space dumping. | |
| 1017 // We prefer to not handle this generally, so we always reinitialize these detail messages. | |
| 1018 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); | |
| 1019 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); | |
| 1020 | |
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1021 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); |
| 0 | 1022 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); |
| 1023 | |
| 1024 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); | |
| 1025 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); | |
| 1026 | |
| 1027 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); | |
| 1028 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); | |
| 1029 | |
| 1030 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); | |
| 1031 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); | |
| 1032 | |
| 1033 // Setup the array of errors that have preallocated backtrace | |
| 1034 k = Universe::_out_of_memory_error_java_heap->klass(); | |
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1035 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); |
| 0 | 1036 k_h = instanceKlassHandle(THREAD, k); |
| 1037 | |
| 1038 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; | |
| 1039 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); | |
| 1040 for (int i=0; i<len; i++) { | |
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1041 oop err = k_h->allocate_instance(CHECK_false); |
| 0 | 1042 Handle err_h = Handle(THREAD, err); |
| 1043 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); | |
| 1044 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); | |
| 1045 } | |
| 1046 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; | |
| 1047 } | |
| 1048 | |
| 1049 | |
| 1050 // Setup static method for registering finalizers | |
| 1051 // The finalizer klass must be linked before looking up the method, in | |
| 1052 // case it needs to get rewritten. | |
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1053 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); |
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1054 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( |
| 0 | 1055 vmSymbols::register_method_name(), |
| 1056 vmSymbols::register_method_signature()); | |
| 1057 if (m == NULL || !m->is_static()) { | |
| 1058 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
| 1059 "java.lang.ref.Finalizer.register", false); | |
| 1060 } | |
| 1061 Universe::_finalizer_register_cache->init( | |
| 1142 | 1062 SystemDictionary::Finalizer_klass(), m, CHECK_false); |
| 0 | 1063 |
| 1064 // Resolve on first use and initialize class. | |
| 1065 // Note: No race-condition here, since a resolve will always return the same result | |
| 1066 | |
| 1067 // Setup method for security checks | |
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1068 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); |
| 0 | 1069 k_h = instanceKlassHandle(THREAD, k); |
| 1070 k_h->link_class(CHECK_false); | |
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1071 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); |
| 0 | 1072 if (m == NULL || m->is_static()) { |
| 1073 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
| 1074 "java.lang.reflect.Method.invoke", false); | |
| 1075 } | |
| 1076 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); | |
| 1077 | |
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1078 // Setup method for registering loaded classes in class loader vector |
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1079 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); |
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1080 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); |
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1081 if (m == NULL || m->is_static()) { |
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1082 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), |
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1083 "java.lang.ClassLoader.addClass", false); |
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1084 } |
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1085 Universe::_loader_addClass_cache->init( |
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1086 SystemDictionary::ClassLoader_klass(), m, CHECK_false); |
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1087 |
| 11010 | 1088 // Setup method for checking protection domain |
| 1089 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); | |
| 1090 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> | |
| 1091 find_method(vmSymbols::impliesCreateAccessControlContext_name(), | |
| 1092 vmSymbols::void_boolean_signature()); | |
| 1093 // Allow NULL which should only happen with bootstrapping. | |
| 1094 if (m != NULL) { | |
| 1095 if (m->is_static()) { | |
| 1096 // NoSuchMethodException doesn't actually work because it tries to run the | |
| 1097 // <init> function before java_lang_Class is linked. Print error and exit. | |
| 1098 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); | |
| 1099 return false; // initialization failed | |
| 1100 } | |
| 1101 Universe::_pd_implies_cache->init( | |
| 1102 SystemDictionary::ProtectionDomain_klass(), m, CHECK_false);; | |
| 1103 } | |
| 1104 | |
| 0 | 1105 // The folowing is initializing converter functions for serialization in |
| 1106 // JVM.cpp. If we clean up the StrictMath code above we may want to find | |
| 1107 // a better solution for this as well. | |
| 1108 initialize_converter_functions(); | |
| 1109 | |
| 1110 // This needs to be done before the first scavenge/gc, since | |
| 1111 // it's an input to soft ref clearing policy. | |
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1112 { |
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1113 MutexLocker x(Heap_lock); |
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1114 Universe::update_heap_info_at_gc(); |
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1115 } |
| 0 | 1116 |
| 1117 // ("weak") refs processing infrastructure initialization | |
| 1118 Universe::heap()->post_initialize(); | |
| 1119 | |
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1120 // Initialize performance counters for metaspaces |
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1121 MetaspaceCounters::initialize_performance_counters(); |
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1122 |
| 0 | 1123 GC_locker::unlock(); // allow gc after bootstrapping |
| 1124 | |
| 1125 MemoryService::set_universe_heap(Universe::_collectedHeap); | |
| 1126 return true; | |
| 1127 } | |
| 1128 | |
| 1129 | |
| 1130 void Universe::compute_base_vtable_size() { | |
| 1131 _base_vtable_size = ClassLoader::compute_Object_vtable(); | |
| 1132 } | |
| 1133 | |
| 1134 | |
| 1135 // %%% The Universe::flush_foo methods belong in CodeCache. | |
| 1136 | |
| 1137 // Flushes compiled methods dependent on dependee. | |
| 1138 void Universe::flush_dependents_on(instanceKlassHandle dependee) { | |
| 1139 assert_lock_strong(Compile_lock); | |
| 1140 | |
| 1141 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
| 1142 | |
| 1143 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1144 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1145 // holding the CodeCache_lock. | |
| 1146 | |
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1147 KlassDepChange changes(dependee); |
| 0 | 1148 |
| 1149 // Compute the dependent nmethods | |
| 1150 if (CodeCache::mark_for_deoptimization(changes) > 0) { | |
| 1151 // At least one nmethod has been marked for deoptimization | |
| 1152 VM_Deoptimize op; | |
| 1153 VMThread::execute(&op); | |
| 1154 } | |
| 1155 } | |
| 1156 | |
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1157 // Flushes compiled methods dependent on a particular CallSite |
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1158 // instance when its target is different than the given MethodHandle. |
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1159 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { |
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1160 assert_lock_strong(Compile_lock); |
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1161 |
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1162 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; |
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1163 |
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1164 // CodeCache can only be updated by a thread_in_VM and they will all be |
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1165 // stopped dring the safepoint so CodeCache will be safe to update without |
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1166 // holding the CodeCache_lock. |
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1167 |
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1168 CallSiteDepChange changes(call_site(), method_handle()); |
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1169 |
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1170 // Compute the dependent nmethods that have a reference to a |
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1171 // CallSite object. We use InstanceKlass::mark_dependent_nmethod |
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1172 // directly instead of CodeCache::mark_for_deoptimization because we |
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1173 // want dependents on the call site class only not all classes in |
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1174 // the ContextStream. |
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1175 int marked = 0; |
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1176 { |
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1177 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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1178 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); |
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1179 marked = call_site_klass->mark_dependent_nmethods(changes); |
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1180 } |
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1181 if (marked > 0) { |
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1182 // At least one nmethod has been marked for deoptimization |
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1183 VM_Deoptimize op; |
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1184 VMThread::execute(&op); |
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1185 } |
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1186 } |
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1187 |
| 0 | 1188 #ifdef HOTSWAP |
| 1189 // Flushes compiled methods dependent on dependee in the evolutionary sense | |
| 1190 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { | |
| 1191 // --- Compile_lock is not held. However we are at a safepoint. | |
| 1192 assert_locked_or_safepoint(Compile_lock); | |
| 1193 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
| 1194 | |
| 1195 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1196 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1197 // holding the CodeCache_lock. | |
| 1198 | |
| 1199 // Compute the dependent nmethods | |
| 1200 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { | |
| 1201 // At least one nmethod has been marked for deoptimization | |
| 1202 | |
| 1203 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
| 1204 // Stuff copied from VM_Deoptimize and modified slightly. | |
| 1205 | |
| 1206 // We do not want any GCs to happen while we are in the middle of this VM operation | |
| 1207 ResourceMark rm; | |
| 1208 DeoptimizationMarker dm; | |
| 1209 | |
| 1210 // Deoptimize all activations depending on marked nmethods | |
| 1211 Deoptimization::deoptimize_dependents(); | |
| 1212 | |
| 1213 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
| 1214 CodeCache::make_marked_nmethods_not_entrant(); | |
| 1215 } | |
| 1216 } | |
| 1217 #endif // HOTSWAP | |
| 1218 | |
| 1219 | |
| 1220 // Flushes compiled methods dependent on dependee | |
| 1221 void Universe::flush_dependents_on_method(methodHandle m_h) { | |
| 1222 // --- Compile_lock is not held. However we are at a safepoint. | |
| 1223 assert_locked_or_safepoint(Compile_lock); | |
| 1224 | |
| 1225 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1226 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1227 // holding the CodeCache_lock. | |
| 1228 | |
| 1229 // Compute the dependent nmethods | |
| 1230 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { | |
| 1231 // At least one nmethod has been marked for deoptimization | |
| 1232 | |
| 1233 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
| 1234 // Stuff copied from VM_Deoptimize and modified slightly. | |
| 1235 | |
| 1236 // We do not want any GCs to happen while we are in the middle of this VM operation | |
| 1237 ResourceMark rm; | |
| 1238 DeoptimizationMarker dm; | |
| 1239 | |
| 1240 // Deoptimize all activations depending on marked nmethods | |
| 1241 Deoptimization::deoptimize_dependents(); | |
| 1242 | |
| 1243 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
| 1244 CodeCache::make_marked_nmethods_not_entrant(); | |
| 1245 } | |
| 1246 } | |
| 1247 | |
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1248 void Universe::print() { |
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1249 print_on(gclog_or_tty); |
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1250 } |
| 0 | 1251 |
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1252 void Universe::print_on(outputStream* st, bool extended) { |
| 0 | 1253 st->print_cr("Heap"); |
|
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1254 if (!extended) { |
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1255 heap()->print_on(st); |
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1256 } else { |
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1257 heap()->print_extended_on(st); |
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1258 } |
| 0 | 1259 } |
| 1260 | |
| 1261 void Universe::print_heap_at_SIGBREAK() { | |
| 1262 if (PrintHeapAtSIGBREAK) { | |
| 1263 MutexLocker hl(Heap_lock); | |
| 1264 print_on(tty); | |
| 1265 tty->cr(); | |
| 1266 tty->flush(); | |
| 1267 } | |
| 1268 } | |
| 1269 | |
| 4944 | 1270 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { |
| 0 | 1271 st->print_cr("{Heap before GC invocations=%u (full %u):", |
| 1272 heap()->total_collections(), | |
| 1273 heap()->total_full_collections()); | |
| 4944 | 1274 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1275 heap()->print_on(st); |
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1276 } else { |
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1277 heap()->print_extended_on(st); |
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1278 } |
| 0 | 1279 } |
| 1280 | |
| 4944 | 1281 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { |
| 0 | 1282 st->print_cr("Heap after GC invocations=%u (full %u):", |
| 1283 heap()->total_collections(), | |
| 1284 heap()->total_full_collections()); | |
| 4944 | 1285 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1286 heap()->print_on(st); |
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1287 } else { |
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1288 heap()->print_extended_on(st); |
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1289 } |
| 0 | 1290 st->print_cr("}"); |
| 1291 } | |
| 1292 | |
| 6008 | 1293 void Universe::verify(bool silent, VerifyOption option) { |
| 0 | 1294 // The use of _verify_in_progress is a temporary work around for |
| 1295 // 6320749. Don't bother with a creating a class to set and clear | |
| 1296 // it since it is only used in this method and the control flow is | |
| 1297 // straight forward. | |
| 1298 _verify_in_progress = true; | |
| 1299 | |
| 1300 COMPILER2_PRESENT( | |
| 1301 assert(!DerivedPointerTable::is_active(), | |
| 1302 "DPT should not be active during verification " | |
| 1303 "(of thread stacks below)"); | |
| 1304 ) | |
| 1305 | |
| 1306 ResourceMark rm; | |
| 1307 HandleMark hm; // Handles created during verification can be zapped | |
| 1308 _verify_count++; | |
| 1309 | |
| 1310 if (!silent) gclog_or_tty->print("[Verifying "); | |
| 1311 if (!silent) gclog_or_tty->print("threads "); | |
| 1312 Threads::verify(); | |
| 6008 | 1313 heap()->verify(silent, option); |
| 0 | 1314 |
| 1315 if (!silent) gclog_or_tty->print("syms "); | |
| 1316 SymbolTable::verify(); | |
| 1317 if (!silent) gclog_or_tty->print("strs "); | |
| 1318 StringTable::verify(); | |
| 1319 { | |
| 1320 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 1321 if (!silent) gclog_or_tty->print("zone "); | |
| 1322 CodeCache::verify(); | |
| 1323 } | |
| 1324 if (!silent) gclog_or_tty->print("dict "); | |
| 1325 SystemDictionary::verify(); | |
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1326 #ifndef PRODUCT |
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1327 if (!silent) gclog_or_tty->print("cldg "); |
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1328 ClassLoaderDataGraph::verify(); |
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1329 #endif |
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1330 if (!silent) gclog_or_tty->print("metaspace chunks "); |
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1331 MetaspaceAux::verify_free_chunks(); |
| 0 | 1332 if (!silent) gclog_or_tty->print("hand "); |
| 1333 JNIHandles::verify(); | |
| 1334 if (!silent) gclog_or_tty->print("C-heap "); | |
| 1335 os::check_heap(); | |
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1336 if (!silent) gclog_or_tty->print("code cache "); |
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1337 CodeCache::verify_oops(); |
| 0 | 1338 if (!silent) gclog_or_tty->print_cr("]"); |
| 1339 | |
| 1340 _verify_in_progress = false; | |
| 1341 } | |
| 1342 | |
| 1343 // Oop verification (see MacroAssembler::verify_oop) | |
| 1344 | |
| 1345 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; | |
| 1346 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; | |
| 1347 | |
| 1348 | |
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1349 #ifndef PRODUCT |
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1350 |
| 0 | 1351 static void calculate_verify_data(uintptr_t verify_data[2], |
| 1352 HeapWord* low_boundary, | |
| 1353 HeapWord* high_boundary) { | |
| 1354 assert(low_boundary < high_boundary, "bad interval"); | |
| 1355 | |
| 1356 // decide which low-order bits we require to be clear: | |
| 1357 size_t alignSize = MinObjAlignmentInBytes; | |
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1358 size_t min_object_size = CollectedHeap::min_fill_size(); |
| 0 | 1359 |
| 1360 // make an inclusive limit: | |
| 1361 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; | |
| 1362 uintptr_t min = (uintptr_t)low_boundary; | |
| 1363 assert(min < max, "bad interval"); | |
| 1364 uintptr_t diff = max ^ min; | |
| 1365 | |
| 1366 // throw away enough low-order bits to make the diff vanish | |
| 1367 uintptr_t mask = (uintptr_t)(-1); | |
| 1368 while ((mask & diff) != 0) | |
| 1369 mask <<= 1; | |
| 1370 uintptr_t bits = (min & mask); | |
| 1371 assert(bits == (max & mask), "correct mask"); | |
| 1372 // check an intermediate value between min and max, just to make sure: | |
| 1373 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); | |
| 1374 | |
| 1375 // require address alignment, too: | |
| 1376 mask |= (alignSize - 1); | |
| 1377 | |
| 1378 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { | |
| 1379 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); | |
| 1380 } | |
| 1381 verify_data[0] = mask; | |
| 1382 verify_data[1] = bits; | |
| 1383 } | |
| 1384 | |
| 1385 // Oop verification (see MacroAssembler::verify_oop) | |
| 1386 | |
| 1387 uintptr_t Universe::verify_oop_mask() { | |
| 1388 MemRegion m = heap()->reserved_region(); | |
| 1389 calculate_verify_data(_verify_oop_data, | |
| 1390 m.start(), | |
| 1391 m.end()); | |
| 1392 return _verify_oop_data[0]; | |
| 1393 } | |
| 1394 | |
| 1395 | |
| 1396 | |
| 1397 uintptr_t Universe::verify_oop_bits() { | |
| 1398 verify_oop_mask(); | |
| 1399 return _verify_oop_data[1]; | |
| 1400 } | |
| 1401 | |
| 1402 uintptr_t Universe::verify_mark_mask() { | |
| 1403 return markOopDesc::lock_mask_in_place; | |
| 1404 } | |
| 1405 | |
| 1406 uintptr_t Universe::verify_mark_bits() { | |
| 1407 intptr_t mask = verify_mark_mask(); | |
| 1408 intptr_t bits = (intptr_t)markOopDesc::prototype(); | |
| 1409 assert((bits & ~mask) == 0, "no stray header bits"); | |
| 1410 return bits; | |
| 1411 } | |
| 1412 #endif // PRODUCT | |
| 1413 | |
| 1414 | |
| 1415 void Universe::compute_verify_oop_data() { | |
| 1416 verify_oop_mask(); | |
| 1417 verify_oop_bits(); | |
| 1418 verify_mark_mask(); | |
| 1419 verify_mark_bits(); | |
| 1420 } | |
| 1421 | |
| 1422 | |
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1423 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { |
| 0 | 1424 if (!UseSharedSpaces) { |
| 1425 _klass = k; | |
| 1426 } | |
| 1427 #ifndef PRODUCT | |
| 1428 else { | |
| 1429 // sharing initilization should have already set up _klass | |
| 1430 assert(_klass != NULL, "just checking"); | |
| 1431 } | |
| 1432 #endif | |
| 1433 | |
| 1434 _method_idnum = m->method_idnum(); | |
| 1435 assert(_method_idnum >= 0, "sanity check"); | |
| 1436 } | |
| 1437 | |
| 1438 | |
| 1439 ActiveMethodOopsCache::~ActiveMethodOopsCache() { | |
| 1440 if (_prev_methods != NULL) { | |
| 1441 delete _prev_methods; | |
| 1442 _prev_methods = NULL; | |
| 1443 } | |
| 1444 } | |
| 1445 | |
| 1446 | |
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1447 void ActiveMethodOopsCache::add_previous_version(Method* const method) { |
| 0 | 1448 assert(Thread::current()->is_VM_thread(), |
| 1449 "only VMThread can add previous versions"); | |
| 1450 | |
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1451 // Only append the previous method if it is executing on the stack. |
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1452 if (method->on_stack()) { |
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1453 |
| 0 | 1454 if (_prev_methods == NULL) { |
| 1455 // This is the first previous version so make some space. | |
| 1456 // Start with 2 elements under the assumption that the class | |
| 1457 // won't be redefined much. | |
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1458 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); |
| 0 | 1459 } |
| 1460 | |
| 1461 // RC_TRACE macro has an embedded ResourceMark | |
| 1462 RC_TRACE(0x00000100, | |
| 1463 ("add: %s(%s): adding prev version ref for cached method @%d", | |
| 1464 method->name()->as_C_string(), method->signature()->as_C_string(), | |
| 1465 _prev_methods->length())); | |
| 1466 | |
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1467 _prev_methods->append(method); |
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1468 } |
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1469 |
| 0 | 1470 |
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1471 // Since the caller is the VMThread and we are at a safepoint, this is a good |
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1472 // time to clear out unused method references. |
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1473 |
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1474 if (_prev_methods == NULL) return; |
| 0 | 1475 |
| 1476 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
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1477 Method* method = _prev_methods->at(i); |
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1478 assert(method != NULL, "weak method ref was unexpectedly cleared"); |
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1479 |
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1480 if (!method->on_stack()) { |
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1481 // This method isn't running anymore so remove it |
| 0 | 1482 _prev_methods->remove_at(i); |
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1483 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); |
| 0 | 1484 } else { |
| 1485 // RC_TRACE macro has an embedded ResourceMark | |
| 1486 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", | |
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1487 method->name()->as_C_string(), method->signature()->as_C_string(), i)); |
| 0 | 1488 } |
| 1489 } | |
| 1490 } // end add_previous_version() | |
| 1491 | |
| 1492 | |
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1493 bool ActiveMethodOopsCache::is_same_method(Method* const method) const { |
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1494 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1495 Method* check_method = ik->method_with_idnum(method_idnum()); |
| 0 | 1496 assert(check_method != NULL, "sanity check"); |
| 1497 if (check_method == method) { | |
| 1498 // done with the easy case | |
| 1499 return true; | |
| 1500 } | |
| 1501 | |
| 1502 if (_prev_methods != NULL) { | |
| 1503 // The cached method has been redefined at least once so search | |
| 1504 // the previous versions for a match. | |
| 1505 for (int i = 0; i < _prev_methods->length(); i++) { | |
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1506 check_method = _prev_methods->at(i); |
| 0 | 1507 if (check_method == method) { |
| 1508 // a previous version matches | |
| 1509 return true; | |
| 1510 } | |
| 1511 } | |
| 1512 } | |
| 1513 | |
| 1514 // either no previous versions or no previous version matched | |
| 1515 return false; | |
| 1516 } | |
| 1517 | |
| 1518 | |
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1519 Method* LatestMethodOopCache::get_Method() { |
| 11010 | 1520 if (klass() == NULL) return NULL; |
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1521 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1522 Method* m = ik->method_with_idnum(method_idnum()); |
| 0 | 1523 assert(m != NULL, "sanity check"); |
| 1524 return m; | |
| 1525 } | |
| 1526 | |
| 1527 | |
| 1528 #ifdef ASSERT | |
| 1529 // Release dummy object(s) at bottom of heap | |
| 1530 bool Universe::release_fullgc_alot_dummy() { | |
| 1531 MutexLocker ml(FullGCALot_lock); | |
| 1532 if (_fullgc_alot_dummy_array != NULL) { | |
| 1533 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { | |
| 1534 // No more dummies to release, release entire array instead | |
| 1535 _fullgc_alot_dummy_array = NULL; | |
| 1536 return false; | |
| 1537 } | |
| 1538 if (!UseConcMarkSweepGC) { | |
| 1539 // Release dummy at bottom of old generation | |
| 1540 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
| 1541 } | |
| 1542 // Release dummy at bottom of permanent generation | |
| 1543 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
| 1544 } | |
| 1545 return true; | |
| 1546 } | |
| 1547 | |
| 1548 #endif // ASSERT |